Modern Vespa

I want to be sure I assembled the Autolube & carb box properly on my P125x. I'm using this image as a reference, and it's not really clarifying things for me.

http://www.scooterwest.com/items/?_pageCCS=t#page=/items/Crankcase-and-Oil-Injection-Mixer/717

When I took things apart, the Oil Pump Pinion Shaft (item 23 in that diagram) just fell out when I was cleaning the engine (it was off the frame and upside down) so I didn't see if there was an oring on that actual shaft, nor did I find one.

Is there supposed to be one?

According to a post in this thread, it sounds like there should be one?

'75 Rally Auto Lube Question (Here is Quote: "The o-ring's in the Piaggio gasket kit, when replaced the cap it kinda stands proud until you install the airbox which seats it..")

Also, what is item #59 in this image?

http://www.scooterhelp.com/manuals/VNX1T.VSX1T.parts/page018.jpg

Is it a washer, and where does it go exactly?

Thanks for the assistance. This is my fist Autolube tackling project. I get it how it works (especially thanks to this post here) http://www.vespalabs.org/Wiki/Vespa_101/Engine/Autolube# but I'm not sure about some of the parts involved mentioned above.

a) On P-series', there is no o-ring on the oil pinion gear
b) It looks like a washer, but keep in mind the diagram shows just the parts, not the order/placement in which the parts are to be assembled. For example, that diagram shows the spring *above* the metering gear/pump. That is obviously not correct.

Thank you. I've been losing my mind here. You have just helped me have a better weekend!